William m



WILLIAM MoMONNIE-S, BROOKLYN,- NEW YORK.

Letters Pakent No. 99,582, dated February 8, 1870.

GRATEQBAR.

*Nwe- Th'e Schedule referred toin: these Letters Patent and making part of the same.

To all whom it may concern Be it known that I, WILLIAMMCMONNIEsof the city of Brooklyn, in the county of Kings, State of New York, have invented an Improvement in Grate-Bars; and 1 do hereby declare the following to be a full and exact description thereof, which will enable -others skilled in the art to make and use thc same, reference being had to the accompanying drawings, forming a part of this specilication, in whichb Figure l is a view ofthe side of my improved grate- Figure 2 is a view ofthe top edge of the bar.

Figure 3 is a longitudinalsection, taken centrally through the bar in a vertical plane.

Figure 4 is a similar section, taken through a bar having the top-piece united to .it by a dovctail.

Figure 5 is an enlarged cross-'section through the bar of gs. 1 and 2.

Figure 6 is an enlarged cross-section taken through the bar-of fig. 4.

Similar letters of reference indicate like parts in all the figures.

This invention relates to an improvement ou the construction of grate-bars for furnaces for steam-boilers and other purposes, and also for lire-places generally.

The nature of my invention consists in a combination of wrought-iron with cast-iron in the construction y of grate-bars, in such manner that the wrought-metal,

which has the greatest power of resisting intense heat, will be presented to the re, and ai'ord protection to the cast-metal, which latter constitutes the body of the bar, as will be hereafter explained.

Y I am aware that previous to my invention, gratebars have been constructed entirely of wrought-metal, but owing to the expense of this metal, it has been found more economical to construct the bars of castiron. Cast-iron bars are very soon burned out, when subjected to the intense beat of a furnace tire, and to increase their durability, grate-bars have `been constructed with removable cast-iron top-pieces, which could be detached from the main portions ofthe bar,

y carrying it into effect.

In the accompanying drawings, figs. 1, 2, 3, and 5, I have represented my-invention applied to a gratebarof a Well-known form. The body or main portion A, of this bar, is of cast-iron, and the top, strip, or cap, J, is of wrought-metal, united to the top edge of the portion A during the process of" casting this portion, by forming 4flaring holes into or through the Vcap J, at suitable distances apart, andarranging this cap in the muld in such a manner that the cast-metal will till these places, as indicated at K K, and thus tirml'y and permanently uniting the cast-metal and wrought-metal.

Instead of holes made into or through the wroughtmetal cap J, a=dovetail tenon or rib, I, may be rolled onthe' caps, as shown in iigs. 4 and 6, and the castmetal body A united 4by casting, substantially as above described. In this instance the connection of the cap to the bar or lbody A, is eected by a dovetail coupling; that is to say, by the embedding of the tenon or rib into the upper edge of the bar A.

Having described my invention,

What I claim as new, and desire to secure by .Letters Patent, is' i The Vconstruction of grate-bars, for steam and other purposes, with wrought-iron caps and cast-iron bodies, substantially as shown and described.

' WM. MCMONNIES.

Witnesses:

.' WARREN E. HILL, A. W."IAYL0R.` 

